30mm vs 50mm lens on a cropped sensor

I was set on getting the Canon 50mm f/1.4 prime lens as the next purchase from my newly acquired 500D (with the standard 18-55mm/3.5-5 lens that came with it).

Reading a few forums, I get the impression that the 50mm on a cropped-frame camera like the 500D/50D has too small a field of view (i.e. zoomed in too much) to be useful indoors. And that a 30mm is a more useful prime lens to consider.